I have two spheres in Unity. One is 1000x in size other is 1x in size. So I want the smaller sphere to be attracted to bigger sphere. So how do I do it. I know that it can be down through gravity using rigid body. But how do I change gravity angle towards the big sphere?
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Gravity in the Unity physics engine only goes in one direction and is controlled in the Physics menu in the Edit->Project Settings menu.
If you want to do something other than that, you'll have to implement your own gravity. Basically, you can add a sphere collider on the object you want to be the center of gravity. The collider should encompass the entire area where you want objects to be affected by the gravity of that object. Whenever an object collides with this "sphere of influence", you apply a force to it. You continue to apply a force to it as long as it's inside the sphere of influence. The gravitational constant you use can be tweaked by you, but the standard one used for calculations in the real world is:
Spelled out that's:
Do note that Gravitational constant is not 9.81. That's the acceleration caused by gravity at the earth's surface. |
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There's no need to resort to the gravitational equation. Acceleration due to gravity is constant regardless of mass, so all you want to do is accelerate your small objects towards the large-object each frame. The code would look something like this: |
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What others said, gravity on unity is only towards a certain direction, so maybe you should instead disable gravity completly and script a force that moves the small sphere towards the huge one. |
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